En-6
5.7.3. Fix the unit (When hanging on the wall)
Use the tapping screw B (accessories) to set up this unit.
6. PIPE INSTALLATION
6.1. Pipe selection
• Select the pipe to connect to the RB unit.
Connection example 1
Outdoor
unit
Indoor
unit
(Liquid pipe)
Discharge
gas pipe
Gas pipe
RB
unit
Suction
gas pipe
Select the connection pipe from Table
2 below, based on the capacity of the
indoor unit connected downstream.
Connection example 2
Outdoor
unit
Indoor
unit
Indoor
unit
(Liquid pipe)
Select the connection pipe from Table 3
below, based on the total capacity of the
indoor unit connected downstream.
Discharge
gas pipe
RB
unit
Suction
gas pipe
Gas pipe
• If the size of the selected pipe is different from Table 1 below, use reducers (accesso-
ries) to make the diameters match.
RB unit
Gas pipe
Discharge
gas pipe
Suction
gas pipe
Reducer
Reducer
Install the liquid pipe after referring to the outdoor unit installation manual for its diameter.
(1) UTP-RU01AH
Table 1) RB unit pipe size
Suction gas pipe
[in (mm)]
Discharge gas pipe
[in (mm)]
Gas pipe
[in (mm)]
1/2 (12.7)
3/8 (9.52)
1/2 (12.7)
Table 2) Connection pipe selection for when only 1 indoor unit is connected.
Indoor unit capacity
[Btu/h]
Suction gas pipe
[in (mm)]
Discharge gas
pipe [in (mm)]
Gas pipe
[in (mm)]
7,500 9,500
12,000 14,000
1/2 (12.7)
3/8 (9.52)
1/2 (12.7)
18,000 24,000
5/8 (15.88)
+Reducer
1/2 (12.7)
+Reducer
5/8 (15.88)
+Reducer
Table 3) Connection pipe selection for when 2 to 3 indoor units are connected.
Total capacity of
indoor unit
[Btu/h]
Suction gas pipe
[in (mm)]
Discharge gas
pipe [in (mm)]
Gas pipe
[in (mm)]
15,000
≤
x < 27,000
5/8 (15.88)
+Reducer
1/2 (12.7)
+Reducer
5/8 (15.88)
+Reducer
(2) UTP-RU01BH
Table 1) RB unit pipe size
Suction gas pipe
[in (mm)]
Discharge gas pipe
[in (mm)]
Gas pipe
[in (mm)]
3/4 (19.05)
1/2 (12.7)
3/4 (19.05)
Table 2) Connection pipe selection for when only 1 indoor unit is connected.
Indoor unit capacity
[Btu/h]
Suction gas pipe
[in (mm)]
Discharge gas
pipe [in (mm)]
Gas pipe
[in (mm)]
7,500 9,500
12,000 14,000
1/2 (12.7)
+Reducer
3/8 (9.52)
+Reducer
1/2 (12.7)
+Reducer
18,000 24,000
30,000
5/8 (15.88)
+Reducer
1/2 (12.7)
5/8 (15.88)
+Reducer
36,000 48,000
3/4 (19.05)
1/2 (12.7)
3/4 (19.05)
60,000
3/4 (19.05)
5/8 (15.88)
+Reducer
3/4 (19.05)
Table 3) Connection pipe selection for when 2 to 8 indoor units are connected.
Total capacity of
indoor unit
[Btu/h]
Suction gas pipe
[in (mm)]
Discharge gas
pipe [in (mm)]
Gas pipe
[in (mm)]
15,000
≤
x < 36,000
5/8 (15.88)
+Reducer
1/2 (12.7)
5/8 (15.88)
+Reducer
36,000
≤
x < 48,000
3/4 (19.05)
1/2 (12.7)
3/4 (19.05)
48,000
≤
x < 60,000
7/8 (22.22)
+Reducer
5/8 (15.88)
+Reducer
7/8 (22.22)
+Reducer
(3) UTP-RU01CH
Table 1) RB unit pipe size
Suction gas pipe
[in (mm)]
Discharge gas pipe
[in (mm)]
Gas pipe
[in (mm)]
7/8 (22.22)
3/4 (19.05)
7/8 (22.22)
Table 3) Connection pipe selection for when 2 to 8 indoor units are connected.
Total capacity of
indoor unit
[Btu/h]
Suction gas pipe
[in (mm)]
Discharge gas
pipe [in (mm)]
Gas pipe
[in (mm)]
60,000
≤
x < 72,000
7/8 (22.22)
5/8 (15.88)
+Reducer
7/8 (22.22)
72,000
≤
x < 96,000
7/8 (22.22)
3/4 (19.05)
7/8 (22.22)
(4) Indoor unit model codes and model selection capacity
Model code
07
09
12
14
18
Indoor unit capacity
[Btu/h]
7,500
9,500
12,000
14,000
18,000
Model code
24
30
36
48
60
Indoor unit capacity
[Btu/h]
24,000
30,000
36,000
48,000
60,000
6.2. Selecting the pipe material
Copper pipes
It is necessary to use seamless copper pipes and it is desirable that the amount of
residual oil is less than 0.04 oz./100 ft (40 mg/10 m). Do not use copper pipes having a
collapsed, deformed or discolored portion (especially on the interior surface). Other-
wise, the expansion valve or capillary tube may become blocked with contaminants.
As an air conditioner using R410A incurs pressure higher than when using conventional
refrigerant (R22), it is necessary to choose adequate materials.
Thicknesses of copper pipes used with R410A are as shown in the table. Never use
copper pipes thinner than that in the table even when it is available on the market.
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